Telephone



J. A. BRIGGS Nov. 10, 1936.

TELEPHONE Filed 001.. 4, 1933 I INVENTOR JOSEPH A. BRIGGS 7 ATTORNEY Patented Nova '16, 1936 attest? FATE??? accents returnees Joseph it. Briggs, Briton. hi. 3., assigns)? to litadio Corporation oi America, a corporation or? Dela- Application (Fletcher it, 1933, @erial No. @2354 8 Claims.

This invention relates to telephones and more particularly to telephone transmitters or receivers oi the electromagnetic tyne.

Eeretofore, such apparatus has, in general, been of a very delicate and fragile nature; has required careful machining of the parts in order to secure proper adjustment and has not been capable of adjustment.

One of the objects of the present invention is to provide such a device which is extremely rugsad and capable of withstanding severe shocks and blows. I

Another object of the invention is to provide an improved adjusting means for the armature of such a device.

Another object of the invention is to provide an improved means for firmly holding the arms. ture in an adjusted position irrespective of shocks or blows which may be applied to the device.

Another object of the invention is to provide an improved means for accurately positioning the armature in relation to the pole pieces of the,

magnets and the actuating coil.

. Referring now to the drawing:

Fig. 1 shows a rear view oi. the motor assembly of the telephone, looking toward the diaphragm. Fig. 2 shows a vertical section through the unit perpendicular to the vertical axis of Fig. l.

Fig. 3 is a detail View of the armature mounting and adjusting mechanism.

The entire motor mechanism shown in these figures is, of course, intended to be enclosed in the usual metal or composition case and to be provided with the usual type of ear piece or mouth piece for operating either as a telephone receiver or transmitter. y

Referring firstto Fig. 2, the device is provided with the usual diaphragm i which is mounted upon a supporting ring 2, forming the base of the motor unit. I

The diaphragm is clamped against the member 2 by means of the retaining ring 8, which is provided with tongues ii, which are clinched over the edge of the member 2 to hold the diaphragm firmly thereag'ainst. The diaphragm is actuated by longitudinal movement of the driving rod 5, which in turn is actuated by the transverse vibration of the armature 6.

The driving motor of the device is oi the polariced type and the laminated silicon steel members i constitute the pole pieces thereof.

These pole pieces are so shaped as to provide the proper clearance for the armature ii at its outer end and so as to clamp the armature firmly therebetween at the inner end of the pole pieces.

(Cl. ltd- 119) The actuating coil 3 is situated in recesses .of the pole pieces, as shown in Fig. 2, and currents passing therethrough cause the armature 6 to be attracted to one or the other pole pieces.

Appropriate magnets are placed in proper re- 5 lation to the pole pieces I with the faces of the magnets in the location shown in dotted lines in Fig. 2, there being one substantially semi-circular cobalt steel magnet on each side of the pole pieces. member 2 and projects rearwardly therefrom surrounding the magnets and providing a mounting for the armature and for the.polepieces.

Referring now to Fig. 3, the armature t is retained in an adjusting member iii, which is prol5 vided with a recess it having? a width of about three times the thickness oi the armature rnemher 6, sothat the spacing members it oi bronze or similar material will fit snugly therein on each side of the armature t.

It will be noted that the slot is made so deep that only a comparatively thickness, or" metal remains, the reason for which will hereafter appear.

The member it is provided witlra semi-cylin- 25 drical face it. through which the slot ii is cut 4 and which fits into the substantially semi-cylindrical recess in the member 9 and is held firmly therein by the cap screws it. it will be noted that it both cap screws it are tightened, the 30 member to will'be flexed at the base of the recess ii and will be thereby caused to grip the spacer members it to the armature very firmly.

While a tightening of one of the screws i5 and loosening of the other will cause an adjustment of the armature 6 about the center of curvature of the cylindrical surface it, the ends of the. bronze members 52 project into thegap between the lower ends of the pole pieces, as shown in Fig. 2, and are held firmly therebetween by pres- 40 sure applied longitudinally of the said pole pieces by the bolts ill and nuts it operating against the bacliplate it. which abuts against the rear pole pieces and thereby forces both pole pieces firmly against base member 2.

A frame member 9 is secured to the base 10 armatures 8 will be flexed between the member Ill and the pole pieces, and the outer end of the armature will, therefore, be flexed in the opposite direction, 1. e., toward the diaphragm.

As shown in Fig. 1, the frame member 5 is provided with a recess at l8 into which the bases of the pole pieces fit, and this recess is wide enough to accommodate also the keys l8, which are riveted to the sides of the said pole pieces, the recess [8 being of a depth substantially identical with the height of the keys l9. Cover plates 20 are provided at each side of the recess l8 and are riveted firmly to the member 9 so as to provide a keyway in whichthe keys l8 fit quite snugly, this fit being substantially what is known as a press fit.

As shown in Fig. 2, the pole pieces"! are provided with extensions adjacent to the keys l9 which abut against the members ii. on the armature 5. These extensions are of such length that the thickness of the members [2 and the member 6 is very slightly greater than the space which would exist between these extensions of the pole pieces with the nuts l6 tightened. Thus, when the pole'pieces are pressed into place, grasping the members I! between them, and the nuts l6 are pulled tight and locked by the tongues on the lock brakes 22, it will be substantially impossible for any type of vibration or shock to displace the relative positions of the several members, which will remain the same even though the device as a whole be somewhat deformed.

An appropriate screw 23 is provided for holding the entire motor unit, hereinabove described, in a case of any usual construction, this screw, of course, being inserted through the back of the case and maintaining either the base member 2 or the tongues 4 against an appropriate rim or recess of the case.

Having described my invention, I claim:

1. A telephone motor comprising a vibratable armature, armature clamping means provided with a cylindrical surface, and means for adjust ing the said clamping means about the axis of curvature of said surface and simultaneously forcing said clamping means into intimate relation with the said armature.

2. A telephone motor comprising a vibratable armature, means clamping the armature at one end and having a cylindrically curved surface, and means for adjusting the said clamping means about the center of curvature of said surface and flexing the clamping means toward the armature for retaining the said armature in said clamping means.

3. A telephone motor of the polarized type comprising a pair of laminated pole pieces each provided with a pair of key members, a frame member provided with a keyway firmly fitting said key members and means for firmly clamping said pole pieces longitudinally of said keyway.

4. A telephone motor comprising a vibratable armature, means clamping the armature at one end and having'a cylindrically curved surface,

means for adjusting the said clamping means about the center of curvature of said surface and flexing the clamping means toward the armature for retaining the said armature in said clamping means, and a driving rod connected to the free end of said armature.

5. A telephone motor comprising a vibratable armature, means clamping the armature at one end and having a cylindrically curved surface, means for adjusting the said clamping means about the center of curvature of said surface and flexing the clamping means toward the annature for retaining the said armature in said clamping means, and means clamping the said armature laterally between the first said means and the free end of the armature.

6. A telephone motor comprising a vibratable armature, means clamping the armature at one end and having a cylindrically curved surface, a member having a surface adapted to cooperate with said cylindrically curved surface, and means holding said clamping means in engagement with said member for adjusting the clamping means about the center of curvature of said surface and firmly retaining said armature in said clamping means.

JOSEPH A. BRIGGS. 

